What is the average time to read or write (Disk Access time) a 512-byte sector for a typical disk rotating at 7,500 RPM? The advertised average seek time is 5.5 ms, the transfer rate is 620 MB/sec. Assume that you have a single head, one platter and one surface. What would the average access time be for a 4 MB file on such a disk. Assume that the sectors of the file is fragmented and it's sectors are randomly distributed.